Considering I barely made it through the first half of season one the fact that I enjoyed season two so much is saying a lot. Somehow things finally came together and I'm now hoping that we get a third installment!
Positives: Finally we've managed to develop the characters and world enough that the mysteries and relationships are all starting to come together. xxxHOLic has always been about enjoying the exploration into CLAMP's world together with the characters, but at last I'm feeling like there's more reward for the time being invested.
The art has always been fun to watch, but more importantly the characters are really coming to life in this season. The relations between the main characters and the sub characters all grow significantly in this season to the point where the characters are becoming dear. It's also fun to see that within this anime that there are actual consequences for your actions. I'm not all about super realism in my anime, but I do get tired of there being nothing but silver linings at the end of every story.
You'll get in this batch a healthy dose of fun story arcs and with each conclusion you'll find yourself eager to find out what Watanuki decides to drag himself into next.
Of special note I really enjoy a few of the characters, namely the pipe fox, and his secondary love interest who's name I can't seem to recall right now.
Negatives: Overall this season was a pleasure to watch. With the first I'd had a few issues, but most of those have been washed away. If I had to come up with something I would say that a few of the plots were regurgitated stories we've all heard before. I suppose this isn't a big deal since what we're dealing with is traditional japanese supernature, but I was a bit disappointed to be watching a show about the monkey's paw, for example.
All in all a good series and a solid follow up to a decent first season. If we get a third and it's as good as the second I'll be first on board!